I am new to using Arduinos, but I am an experienced programmer, know C and JAVA, and have also done various projects with VHDL.

I recently purchased an Arduino Uno and am in the process of trying to get things set up for the first time. I followed the driver installation instructions for Windows 7 (x64), and when I try to upload the Blink example, I get the following verbose output:

All of them. I don't have any programs that scan serial ports, I don't have firewall software that blocks access to serial ports, I'm not reading data over the USB with another program...every other solution looks trivial. Board is on, proper port selected, and proper board selected. Nothing is plugged in except USB, and nothing is touching the board.

I've gotten things working on my Linux partition, so it's not a major issue. Would just be nice to get things working on Windows as well.

My Duemilanove would appear on com 4 and run OK. I plug in the Uno and it does appear in the device manager but the option in the IDE to change the COM port never shows COM 4. I changed the Board to the Uno.

Ran as Administrator and tried compatibility mode. Same results.

System is an Acer laptop. Suggestions? Or is this a Window 7 64bit thing?

Thanks. I added a note about this to the troubleshooting guide: http://arduino.cc/en/Guide/Troubleshooting. It may have something to do with Windows 7, 64 bit being pickier about having signed drivers or something like that.